<template>
  <teleport to="body">
    <transition name="list-fade">
      <div
        class="playlist"
        v-show="visible && playList.length"
        @click="hide"
      >
        <div class="list-wrapper" @click.stop>
          <div class="list-header">
            <h1 class="title">
              <i
                class="icon"
                :class="modeIcon"
                @click="changeMode"
              >
              </i>
              <span class="text">{{modeText}}</span>
              <span class="clear" @click="showConfirm">
                <i class="icon-clear"></i>
              </span>
            </h1>
          </div>
          <scroll
            ref="scrollRef"
            class="list-content"
          >
            <transition-group
              ref="listRef"
              name="list"
              tag="ul"
            >
              <li
                class="item"
                v-for="song in sequenceList"
                :key="song.id"
                @click="() => { selectItem(song) }"
              >
                <i
                  class="current"
                  :class="getCurrentIcon(song)"
                ></i>
                <span class="text">{{song.name}}</span>
                <span class="favorite" @click.stop="() => { toggleFavorite(song) }">
                  <i :class="getFavoriteIcon(song)"></i>
                </span>
                <span
                  class="delete"
                  @click.stop="() => {removeSong(song)}"
                  :class="{'disable': removing}"
                >
                  <i class="icon-delete"></i>
                </span>
              </li>
            </transition-group>
          </scroll>
          <div class="list-add">
            <div class="add" @click="showAddSong">
              <i class="icon-add"></i>
              <span class="text">添加歌曲到队列</span>
            </div>
          </div>
          <div class="list-footer" @click="hide">
            <span>关闭</span>
          </div>
        </div>
        <confirm
          ref="confirmRef"
          @confirm="onConfirmClear"
          text="是否清空播放列表？"
          confirm-btn-text="清空"
        ></confirm>
        <add-song ref="addSongRef"></add-song>
      </div>
    </transition>
  </teleport>
</template>

<script>
import { ref, computed, nextTick, watch } from 'vue'
import { useStore } from 'vuex'
import Scroll from '../base/scroll/Scroll'
import Confirm from '../base/comfirm/Confirm'
import AddSong from '../addSong/AddSong'
import useModeEffect from './use-mode'
import useFavoriteEffect from './use-favorite'
export default {
  name: 'PlayList',
  setup () {
    const visible = ref(false)
    const removing = ref(false)
    const scrollRef = ref(null)
    const listRef = ref(null)
    const confirmRef = ref(null)
    const addSongRef = ref(null)

    const store = useStore()
    const playList = computed(() => store.state.playList)
    const sequenceList = computed(() => store.state.sequenceList)
    const currentSong = computed(() => store.getters.currentSong)

    const { changeMode, modeIcon, modeText } = useModeEffect()

    const { getFavoriteIcon, toggleFavorite } = useFavoriteEffect()

    watch(currentSong, async (newSong) => {
      if (!visible.value || newSong.id) return
      await nextTick()
      scrollToCurrent()
    })

    const getCurrentIcon = (song) => {
      if (song.id === currentSong.value.id) {
        return 'icon-play'
      }
    }

    const selectItem = (song) => {
      const index = playList.value.findIndex(item => song.id === item.id)
      store.commit('setCurrentIndex', index)
      store.commit('setPlayingState', true)
    }

    const showConfirm = () => {
      confirmRef.value.show()
    }

    const onConfirmClear = () => {
      store.dispatch('clearSongList')
      hide()
    }
    function refreshScroll () {
      scrollRef.value.scroll.refresh()
    }

    function scrollToCurrent () {
      const index = sequenceList.value.findIndex(song => currentSong.value.id === song.id)
      if (~index) return
      const target = listRef.value.$el.children[index]
      scrollRef.value.scroll.scrollToElement(target, 300)
    }

    const show = async () => {
      visible.value = true
      await nextTick()
      refreshScroll()
      scrollToCurrent()
    }
    const hide = () => {
      visible.value = false
    }

    const removeSong = (song) => {
      if (removing.value) return
      removing.value = true
      store.dispatch('removeSong', song)
      if (!playList.value.length) {
        hide()
      }
      setTimeout(() => {
        removing.value = false
      }, 300)
    }

    const showAddSong = () => {
      addSongRef.value.show()
    }
    return {
      visible,
      removing,
      scrollRef,
      listRef,
      confirmRef,
      addSongRef,
      playList,
      sequenceList,
      currentSong,
      changeMode,
      modeIcon,
      modeText,
      selectItem,
      getFavoriteIcon,
      toggleFavorite,
      getCurrentIcon,
      showConfirm,
      hide,
      show,
      removeSong,
      onConfirmClear,
      showAddSong
    }
  },
  components: { Scroll, Confirm, AddSong }
}
</script>

<style lang="scss" scoped>
  .playlist {
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    z-index: 200;
    background-color: $color-background-d;
    &.list-fade-enter-active, &.list-fade-leave-active {
      transition: opacity .3s;
      .list-wrapper {
        transition: all .3s;
      }
    }
    &.list-fade-enter-from, &.list-fade-leave-to {
      opacity: 0;
      .list-wrapper {
        transform: translate3d(0, 100%, 0);
      }
    }
    .list-wrapper {
      position: fixed;
      left: 0;
      bottom: 0;
      z-index: 210;
      width: 100%;
      background-color: $color-highlight-background;
      .list-header {
        position: relative;
        padding: 20px 30px 10px 20px;
        .title {
          display: flex;
          align-items: center;
          .icon {
            margin-right: 10px;
            font-size: 24px;
            color: $color-theme-d;
          }
          .text {
            flex: 1;
            font-size: $font-size-medium;
            color: $color-text-l;
          }
          .clear {
            @include extend-click();
            .icon-clear {
              font-size: $font-size-medium;
              color: $color-text-d;
            }
          }
        }
      }
      .list-content {
        max-height: 240px;
        overflow: hidden;
        .item {
          display: flex;
          align-items: center;
          height: 40px;
          padding: 0 30px 0 20px;
          overflow: hidden;
          .current {
            flex: 0 0 20px;
            width: 20px;
            font-size: $font-size-small;
            color: $color-theme-d;
          }
          .text {
            flex: 1;
            @include no-wrap();
            font-size: $font-size-medium;
            color: $color-text-d;
          }
          .favorite {
            @include extend-click();
            margin-right: 15px;
            font-size: $font-size-small;
            color: $color-theme;
            .icon-favorite {
              color: $color-sub-theme;
            }
          }
          .delete {
            @include extend-click();
            font-size: $font-size-small;
            color: $color-theme;
            &.disable {
              color: $color-theme-d;
            }
          }
        }
      }
      .list-add {
        width: 140px;
        margin: 20px auto 30px auto;
        .add {
          display: flex;
          align-items: center;
          padding: 8px 16px;
          border: 1px solid $color-text-l;
          border-radius: 100px;
          color: $color-text-l;
          .icon-add {
            margin-right: 5px;
            font-size: $font-size-small-s;
          }
          .text {
            font-size: $font-size-small;
          }
        }
      }
      .list-footer {
        text-align: center;
        line-height: 50px;
        background: $color-background;
        font-size: $font-size-medium-x;
        color: $color-text-l;
      }
    }
  }
</style>
